[URL="http://api.tweetmeme.com/share?url=http://sports.espn.go.com/nfl/news/story?id=4999642&campaign=rss&source=NFLHeadlines&service=tinyurl.com&source=espn"][IMG]http://api.tweetmeme.com/imagebutton.gif?url=http://sports.espn.go.com/nfl/news/story?id=4999642&campaign=rss&source=NFLHeadlines[/IMG][/URL]While the Minnesota Vikings encouraged Brett Favre to recruit free agent running back LaDainian Tomlinson, a team source said that the quarterback limited his role to texting Tomlinson because of lingering uncertainty about his own NFL future.